Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/13979
Title: Contribution of membrane resistance to mass transfer in ammonia stripping
Authors: TAN SU PING
Keywords: Ammonia stripping, PVDF and PSf microporous membrane, membrane resistance
Issue Date: 26-May-2004
Source: TAN SU PING (2004-05-26). Contribution of membrane resistance to mass transfer in ammonia stripping. ScholarBank@NUS Repository.
Abstract: The adverse effects of ammonia and related compounds commonly found in wastewater treatment systems and fermentation culture media have promoted the development of more efficient methods for their removal. In this study, gas permeable asymmetric polyvinylidene fluoride (PVDF) and polysulfone (PSf) hollow fiber membranes that exhibit good hydrophobicity were used to achieve the purpose. Sulfuric acid was used as stripping solution to accelerate the removal of ammonia from aqueous solutions. To study the effect of membrane resistance to ammonia transfer, several types of hollow fiber membrane with different mean pore radii and effective porosities were prepared by phase-inversion method. Besides, other factors affecting the overall mass transfer of ammonia such as initial ammonia concentration, feed pH, feed and sink velocity, were investigated. The results reveal that the performance of the hollow fiber membrane modules in ammonia removal is dependent on the effective porosity of the membrane. The observed membrane resistance is much larger than that predicted based on gas filled pores. This suggests that the membrane pores were partially wetted. The results indicate that membrane resistance is important and cannot be neglected in the ammonia stripping process.
URI: http://scholarbank.nus.edu.sg/handle/10635/13979
Appears in Collections:Master's Theses (Open)

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2TitlePage.pdf7.13 kBAdobe PDF

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3Acknowledgement.pdf7.57 kBAdobe PDF

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4TableOfContent.pdf10.99 kBAdobe PDF

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5Summary.pdf12.56 kBAdobe PDF

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CH1- Introduction.pdf17.37 kBAdobe PDF

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CH2- Literature Review.pdf86.8 kBAdobe PDF

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CH3-Theoretical Background.pdf111.51 kBAdobe PDF

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CH4-Materials And Methods.pdf159.37 kBAdobe PDF

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CH5-Results & Discussion A.pdf1.3 MBAdobe PDF

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CH5-Results & Discussion B.pdf1.65 MBAdobe PDF

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CH6-Conclusion.pdf30.83 kBAdobe PDF

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D-Reference.pdf28.42 kBAdobe PDF

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E-Appendices.pdf59.84 kBAdobe PDF

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